Process of making rubber bag-bodies.



No. 761,890- APATENTED JUNE-7,1904. I. F. KEPLER.

PROGBSSDF MAKING RUBBER BAG BODIES. v

AP-PLIOATION rnmn we. a1, 1903.

N0 MODEL.

"IRWIN FLOYD KEPLER, OF AKRON, o1-11o, ASSIGNOR TO THE B. F. coon U ITED, STATES Patented June 7, 1904.

PATENT OFF1cE.

' RICH COMPANY, OF OHIO, OF AKRON, OHIO, A CORPORATION OF OHIO.

PROCESS OF MAKING RUBBER BAG-BODIES.

SPECIFICATION forming part of Letters Patent No. 761,890, dated June '7, 1904. Application filed August 31, 1903. Serial No. 171,881. (No specimens.)

To-oell whom it may concern: 7

Be it known that I, IRWIN FLOYD KEPLER, a

' citizen of the United Statesof America, and a resident of the city of Akron, county of Summit and State of Ohio, have invented certain new and useful Improvements in Processes of MakingRubber Bag-Bodies, of which the followingis a specification.

' This invention relates to an improved process of making bag-bodies from sheet-rubber stock, such bodies, for instance, as are used for hot-waterbottles or similar rubber prod ucts.

v The invention has for its object to provide for making a stronger, more durable, and less expensive bag-body and bag than has heretofore been produced.

The usual method of making bag-bodies of this class has been to lapjoin by handwork the two uncured sheet-rubber sides or walls of the body and lay a thin sheet-rubber reinforcing-strip across the lapped edge, applying cement where the parts overlap each other.

funnel and carrying and hanging straps and finally vulcani'zin g the bag. This prior method of forming bag-bodies requires considerable time, and therefore is quite expensive, and there is not the desired certainty of intimate union of the sheet-rubber stock at the cemented lap-joints of the body, which too often prove to be-leaky, thus increasing the percentage of loss or waste and necessarily increasing the cost of perfect finished bags.

In accordance with the preferred manner of carrying out my invention the opposite side walls of the bag-body are first marginally shaped from uncured sheet-rubber stock by cutting-dies, which at the same time give the outside face of said Walls any desired surface ornamentation. A reinforcing rubber-compound strip is next interposed between marginal portions of the bag-body side walls, which then, with this strip between them, are

subjected to pressure, preferably the pressure of finishing-dies,which at a single operation intimately or homogeneously unite said walls and marginal strip and at the same time marginally trim the bag-body and leave it ready for attaching the screw-neck and funnel and hanging-straps prior to vulcanization.

Reference is made to the accompanying drawings, forming part of this specification, 1 1n wh1ch- Figure 1 is a plan view of the lower bagwall-cutting and surface-ornamentmg die-section, and Fig. 2 is a transverse section through the reinforcing-strip introduced marginally between them prior tosubjecting these parts ;-to pressure of the preferred finishing-dies,

. and Fig. 6 is a detail sectional view illustrat- ;ing a marginal portion of the bag after the parts of Fig. 5 have been intimately orhomo- 5 geneously united by pressure. These cemented marginal oints then are handpressed prior to applying the screw-neck and The cutting-die which I preferablyuse to shape the bag-body sides or walls from uncured sheet-rubber stock comprises a bed or female die-section 1 and a plunger or male die-section 2, both shown in Fig. 2 of the drawings and having edges 3, which cooperate in cutting outthe side walls of the bag-body. These die-sections have the usual pin-andgsoeket guides at 4:, assuring perfect register of theircutting edges. One of these die-sections, preferably the bed die-section 1, (shown separately-in Fig. l of the drawings,) has face f. indentations or serrations 5, which give any preferred surface ornamentation to the outer face of the bag-body side wall by final regulated movement of the male die 2 after said wall has been marginally shaped by the die cutting edges 3.

The finishing diefshown in Fig. 4 of the drawings) comprises two opposing sections 6 i 7, which may be substantially alike, each with a raised pressing or cutting edge 8, corresponding with the marginal contour of the i bag-body and having theusual pin-and-socket i guides 9, assuring perfect register of these ter is under pressure of the finishing-die.

tioned.

After the two opposite walls 11 12 of the bag-body are separately cut out marginally and preferably face-ornamented by the dies 1 2 the rubber reinforcing-strip 10, which preferablyhas considerable thickness or body, is laid between said walls all around their margin except at the place where the open mouth of the bag is to be formed. Any method of interposing this reinforcing-strip 10 may be adopted. One preferred plan is to lay one side wall, 12, of the bag-body upon the lower die-section 6 in proper relation to the die pressing edge 8, which may be felt through the wall 12, to serve as a guide in properly laying the strip upon said wall, whereupon the other bag-body side wall, 11, is laid upon the wall 12 and the marginal reinforcing-strip 10, and the three parts 11 10 12 then are relatively disposed about as shown in Fig. 5 of the drawings. The upper die-section 7 now is brought down upon the body-wall 11 and presses the parts 11 1O 12 together, thereby intimately and homogeneously uniting them and at the same time trimming off any possible surplus sheet-rubber material at the extreme marginal edge of the bag-body. \Vhen removed from this finishing-die, the bag-body has marginal portions. (Shown in Fig. 6 of the drawings, wherein the part 10, now in intimate union with the two body-walls 11 12, represents the former separately-applied reinforcing-strip 10 of Fig. 6 of the drawings.) The bag-body now is ready for attachment of the usual screw-neck and funnel and suspension-straps prior to vulcanization of the whole bag, which may be effected in any usual or approved manner.

It is obvious that by the above-described process of manufacture I produce a sheet-rubber bag-body having a heavily beaded or reinforced edge which is homogeneous or practically jointless, and therefore the bag formed with such a body has much greater strength and durability than bags having a body formed by marginal overlapping thin sheet-rubber stock in the usual manner first above men- Furthermore, by my improved process of homogeneously incorporating a marginal reinforcing-strip between and with opposite side walls of the bag-body by pressure, preferably die-pressure, such intimate union of the parts is effected that reliance always may be placed upon the practical perfection of each and every bag having a body so made, whereby waste due to imperfections arising from the lap-joint method of production is practically eliminated. Finally, the actual saving of time in making the stronger and more durable bag-bodies by my improved process largely reduces the first cost of much more desirable linished bags as compared with the expense of producing inferior lap-joined bags.

1 claim as my invention- 1. The improved processof making rubber bag-bodies, which consists in interposing a reinforcing marginal strip of rubber compound between the two side walls of the bag-body, then intimately or homogeneously uniting said body-walls and interposed marginal reinforcing-strip by pressure, and then vulcanizing the bag-body, substantially as described.

2. The improved process of making rubber bag-bodies, which consists in interposinga reinforcing marginal strip of rubber compound between the two side walls of the bag-lmdy, then intimately or homogeneously uniting said body-walls and interposed marginal rein forcing-strip by die-pressure, and then vuleanizing the bag-body, substantially as described.

3. The improved process of making rubber bag-bodies, which consistsin interposing a reinforcing marginal strip of rubber compound between the two side walls of the bag-body, then uniting said body-walls and interposed marginal reinforcing-strip and simultaneoiisly trimming ofl' surplus edge material, and then vulcanizing the bag-body, substantially as described.

4. Theimproved process of making rubber bag-bodies, which consists in interposing a reinforcing marginal strip of rubber compound between the two side walls of the bag-body, then intimately or homogeneously uniting said body-walls and interposed marginal reinforcing-strip and simultanermsly trimmingoll' surplus edge material by pressure, and then vulcanizing the bag-bod y, substantially as described.

5. Theimproved process of making rubber bag-bodies, which consists in interposing a reinforcing marginal strip of rubber compound between the two side walls of the bag-body, then intimately or hon'iogeneously uniting said body-walls and interposed marginal reinforcing-strip and simultaneously trinnningoll' surplus edge material by die-pressure, and then vulcanizing the bagbody, substantially as described.

6. The improved process of making rubber bag-bodies, which consists in marginally shaping the side walls of the body by cutting-dies, then interposing a reinforcing marginal strip of rubber compound between the two die-cut side walls of the body, then intimately orhomogeneously uniting the body-walls and interposed marginal reinforcing-strip by pressure, and then vulcanizing the bag-body, substantially as described.

7 The improved process of making rubber bag-bodies, which consists in marginally shaping the sidewalls of the body by cutting-dies, then interposing a reinforcing marginal strip of rubber compound between the two die-cut side walls of the body, then intimately or homogeneously uniting the body-walls and interposed marginal reinforcing-strip by diepressure, and then vulcanizing the bag-body, substantially as described. r

8. The improved process of making rubber bag-bodies, which consists in marginally shaping the side walls of the body by-cutting-dies, then interposing a reinforcing marginal strip of rubber compound between the two die-cut side walls of the body, then intimately or homogeneously uniting the body-walls and interposed marginal reinforcing-strip and simultaneously trimming off surplus edge material by die-pressure, and then vulcanizing the bagbody, substantially as described.

9. The improved process of making rubber bag-bodies, which consists in marginally shaping the side walls of the body by cutting-dies and simultaneously applying surface ornamentation to said body-walls by said cuttingdies, then interposing a reinforcing marginal strip of rubber compound between the two die-outside walls of the body, then intimately or homogeneously uniting the body-walls and interposed marginal reinforcing-stri p by pres-- sure, and then vulcanizing the bag-body, substantially as described.

10. The improved process of making rubber bag-bodies, which consists in marginally shaping the side walls of the body by cuttingdies and simultaneously applying surface ornamentation to said body-walls by said cutting-dies. then interposing a reinforcing mar namentation to said body-walls by said outting-dies, then interposing a reinforcing marginal strip of rubber compound between the two die-cut side walls of the body, then intimately or homogeneously uniting the bodywalls and interposed marginal strip and simultaneously trimming off surplus edge material by die pressure, and then vulcanizing the bag-body, substantially as described.

IRWIN FLOYD KEPLER.

Witnesses:

HARRY A. BAUMAN, WILLIAM A. MEANs. 

